| According to Popper, it is the falsifiability of a theory which makes it scientific, the more falsifiable the better. |
| He did however hold that theories could be falsified, and that falsifiability, or the liability of a theory to counterexample, was a virtue. |
| The problem here is that falsifiability applies at the level of specific scientific claims whereas both evolution and ID are collections of such claims. |
| It certainly includes his notion of falsifiability, but it is hardly coextensive with it. |
| Popper's falsifiability resembles Charles Peirce's nineteenth century fallibilism. |
| Only universal claims are susceptible to the application of modus tollens that underlies falsifiability. |
